A static mixer

Abstract

The present invention relates to the technical field of physical mixing equipment, and in particular to a static mixer. A static mixer comprises: a shell; a core shaft, which is arranged inside the shell, and the core shaft has a pre-dividing unit close to the liquid inlet end and a mixing unit connected to the pre-dividing unit, the pre-dividing unit is provided with a plurality of first spiral fins, and the mixing unit is provided with a plurality of second spiral fins, and the spacing between two adjacent first spiral fins is greater than the spacing between two adjacent second spiral fins. After the fluid is preliminarily diverted and mixed in the pre-dividing area, it enters the mixing unit for re-mixing, which avoids the situation that the fluid directly enters the mixing unit and only advances along the grooves between the second spiral fins, so that the fluids in the grooves between different second spiral fins cannot contact each other; the first spiral fins and the second spiral fins do not match, and the pre-dividing unit evenly distributes the fluid and then collides with the second spiral fins, quickly changing the flow direction, enhancing the fluid collision strength, and enhancing the mixing effect.

Description

Technical Field

[0001] The invention relates to the technical field of physical mixing equipment, and in particular to a static mixer. Background Art

[0002] The working principle of a static mixer is to allow the fluid to flow in the pipeline and impact various types of plate elements, increasing the velocity gradient of the fluid laminar flow or forming turbulence. In laminar flow, it is "division - position movement - re-merge". In turbulent flow, in addition to the above three situations, the fluid will also produce violent eddies in the cross-sectional direction, with strong shear force acting on the fluid, causing the fluid to further divide and mix, and finally mix to form the required liquid. The mixing effect of the mixer is the most important feature pursued in the application field of the mixer.

[0003] For example, Chinese patent CN108327219A discloses a static mixer, which arranges multiple mixing units in the cylinder of the static mixer on the core shaft along the axial direction, and the mixing blades of two adjacent mixing units rotate in opposite directions, thereby enhancing the mixing effect of the fluid by changing the flow direction of the fluid. Under this structure, the fluid is unevenly distributed, the impact mixing force is weak, and the mixing effect is difficult to meet the needs of liquid mixing in the current process production. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the static mixer in the prior art, such as uneven fluid distribution, weak impact mixing force and poor mixing effect during the fluid mixing process, thereby providing a static mixer.

[0005] In order to solve the above technical problems, the present invention provides a static mixer, comprising:

[0006] case;

[0007] The core shaft is arranged inside the shell, and the core shaft has a pre-dividing unit close to the liquid inlet end and a mixing unit connected to the pre-dividing unit, the pre-dividing unit is provided with a plurality of first spiral fins, the mixing unit is provided with a plurality of second spiral fins, and the spacing between two adjacent first spiral fins is greater than the spacing between two adjacent second spiral fins.

[0008] Preferably, the mixing unit comprises a plurality of subunits spaced apart from each other along the axial direction of the core shaft, and a first annular groove is provided between two adjacent subunits.

[0009] Preferably, the first spiral fin is provided as one extending from one end to the other end of the pre-dividing unit along its rotation direction; and the second spiral fin is provided as a plurality of sub-fins at intervals from one end to the other end of the sub-unit along its rotation direction.

[0010] Preferably, a second annular groove is formed between two sub-fins of the second spiral fin that are spaced apart from each other along the axial direction of the core shaft, and the groove width of the second annular groove is smaller than the groove width of the first annular groove.

[0011] Preferably, the second spiral fins of two adjacent subunits have opposite directions of rotation.

[0012] Preferably, the helix angle of the second helical fin is 25-75 degrees.

[0013] Preferably, a first frustum and a second frustum are provided at the liquid inlet end and the liquid outlet end of the core shaft, respectively. The small end of the first frustum is arranged toward the inlet of the shell, and the small end of the second frustum is arranged toward the outlet of the shell.

[0014] Preferably, it also includes a heat exchange structure sleeved on the outside of the shell.

[0015] Preferably, multiple spiral grooves are formed on the inner wall of the heat exchange structure.

[0016] Preferably, the housing comprises a housing body and an end cover connected by a seal.

[0017] The technical solution of the present invention has the following advantages:

[0018] 1. The static mixer provided by the present invention has a core shaft with a pre-dividing unit close to the liquid inlet end and a mixing unit connected to the pre-dividing unit. The fluid is preliminarily distributed through the pre-dividing area, and enters the mixing unit for re-mixing after uniform diversion and mixing. The setting of the pre-dividing area avoids the situation that the fluid directly enters the mixing unit and only advances along the groove between the second spiral fins, so that the fluids in the grooves between different second spiral fins cannot contact each other, which can effectively enhance the fluid mixing quality; the pre-dividing unit is provided with a plurality of first spiral fins, and the mixing unit is provided with a plurality of second spiral fins, and the spacing between two adjacent first spiral fins is greater than the spacing between two adjacent second spiral fins, and the spacing between the first spiral fins and the second spiral fins does not match, so that the fluid flowing out of the pre-dividing unit cannot directly enter the groove between the second spiral fins, but collides with the second spiral fins, quickly changes the flow direction, enhances the collision strength of the fluids in different flow directions, and enhances the mixing effect.

[0019] 2. The static mixer provided by the present invention comprises a mixing unit comprising a plurality of sub-units spaced apart along the axial direction of the core shaft, and a first annular groove is provided between two adjacent sub-units, so that when the fluid passes through the mixing unit, it can flow along the groove between the second spiral fins, and can also flow in a direction perpendicular to the axis of the core shaft, so that the fluids flowing in multiple directions collide with each other, thereby enhancing the mixing effect.

[0020] 3. In the static mixer provided by the present invention, a first spiral fin is arranged to extend from one end to the other end of the pre-dividing unit along its rotation direction, so that the fluid entering the pre-dividing unit advances along the grooves between the first spiral fins and is diverted into multiple streams; the second spiral fin is arranged to be spaced apart from one end to the other end of the sub-unit along its rotation direction as multiple streams of fluid flowing out of the pre-dividing unit enter the mixing unit, and since the second spiral fin is discontinuous, the fluid cannot smoothly advance in one direction and a strong collision occurs, thereby further enhancing the mixing effect.

[0021] 4. In the static mixer provided by the present invention, a second annular groove is formed between two sub-fins of the second spiral fins arranged axially along the core shaft, and the groove width of the second annular groove is smaller than the groove width of the first annular groove. The flow trend of the fluid in the mixing unit perpendicular to the axis of the core shaft is further enhanced, and the annular grooves of different groove widths are arranged at intervals to increase the number of collisions during the fluid flow process, thereby enhancing the mixing effect.

[0022] 5. In the static mixer provided by the present invention, the rotation directions of the second spiral fins of two adjacent subunits are opposite, which maximizes the rotation directions of the spiral fins on adjacent subunits, thereby maximizing the direction change trend of the fluid when flowing from one subunit to the next, thereby enhancing the mixing effect of the fluid.

[0023] 6. In the static mixer provided by the present invention, the helical angle of the second helical fin is 25-75 degrees, so as to avoid the second helical fin being parallel or perpendicular to the axis of the core shaft, which would cause the second helical fin to be ineffective or directly block the fluid when the fluid flows through the mixing unit.

[0024] 7. The static mixer provided by the present invention is further provided with a first cone and a second cone at the liquid inlet end and the liquid outlet end of the core shaft. The small head end of the first cone is arranged toward the inlet of the shell, and is used to divert the fluid when the fluid enters the range of the core shaft. The small head end of the second cone is arranged toward the outlet of the shell, and is used to converge the fluid when the fluid flows out of the range of the core shaft.

[0025] 8. The static mixer provided by the present invention has different suitable temperatures for mixing different fluids. A heat exchange structure is provided on the outer side of the shell for heat exchange between the inside and outside of the static mixer when the static mixer is working, so that a temperature suitable for fluid mixing is maintained inside the static mixer.

[0026] 9. The static mixer provided by the present invention has a multi-head spiral groove formed on the inner wall of the heat exchange structure, which is used to quickly and evenly distribute heat inside the static mixer to enhance the heat exchange efficiency.

[0027] 10. The static mixer provided by the present invention has a shell comprising a shell body and an end cover connected by a seal, which realizes sealing when the static mixer is working and can increase the pressure resistance of the static mixer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 An exploded view of a static mixer provided in a first embodiment of the present invention.

[0030] Figure 2 It is a cross-sectional view of a static mixer provided in a first embodiment of the present invention.

[0031] Figure 3 It is a schematic structural diagram of the core shaft provided in the first embodiment of the present invention.

[0032] Figure 4 It is a schematic structural diagram of a core shaft provided in a second embodiment of the present invention.

[0033] Figure 5 It is a schematic structural diagram of a static mixer provided in a third embodiment of the present invention.

[0034] Figure 6 A schematic diagram of the fluid flow direction in the mixing unit is provided in the first embodiment of the present invention.

[0035] Explanation of the reference numerals: 1. Shell; 2. Core shaft; 3. Pre-distribution unit; 4. First spiral fin; 5. Mixing unit; 6. Second spiral fin; 7. End cover; 8. First annular groove; 9. First cone; 10. Second cone; 11. Sealing ring; 12. Heat exchange structure; 13. Second annular groove; 14. Shell body. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] like Figure 1 -3 shows a specific embodiment of the static mixer provided by the present invention. The static mixer can be made of stainless steel, titanium and titanium alloys, Hastelloy, zirconium and zirconium alloys, silicon carbide, glass, peek and other materials, and has higher material selection and mixing adaptability. It includes a shell 1 and a core shaft 2. The shell 1 includes a hollow cylindrical shell body 14 and an end cover 7 matched with the shell body 14. The cylindrical shell 1 structure can maximize the pressure resistance of the mixer; the shell body 14 and the end cover 7 are connected by threads, and the end cover 7 is provided with an inlet for the fluid to enter the static mixer, and the shell body 14 is provided with an outlet for the fluid to flow out of the static mixer. A sealing ring 11 as a sealing member is provided between the shell body 14 and the end cover 7, which has good sealing performance and better pressure resistance. At the same time, the static mixer has no welding, so that the static mixer can be disassembled, which is convenient for later maintenance and has low maintenance costs.

[0041] A core shaft 2 is provided inside the shell 1. A pre-dividing unit 3 is provided on the side of the core shaft 2 close to the liquid inlet end. Five first spiral fins 4 are provided on the pre-dividing unit 3. The first spiral fins 4 extend from one end to the other end of the pre-dividing unit 3 along the rotation direction.

[0042] A mixing unit 5 is fixedly connected to the side of the pre-dividing unit 3 away from the liquid inlet end. A plurality of second spiral fins 6 are arranged on the mixing unit 5. The spacing between two adjacent first spiral fins 4 is greater than the spacing between two adjacent second spiral fins 6. The mixing unit 5 includes five sub-units spaced apart along the axial direction of the core shaft 2, and a first annular groove 8 is provided between two adjacent sub-units. The second spiral fin 6 is spaced apart from one end of the sub-unit to the other end along its rotation direction to form a plurality of sub-fins. The sub-fins are approximately rhombus-shaped. The sharp angles of the rhombus cut and divert the fluid to be mixed. The sub-fins with the sharp angle structure of the rhombus are weakened by the impact force of the fluid during use, and the fluid resistance is reduced. A second annular groove 13 is formed between two sub-fins of the second spiral fin 6 spaced apart along the axial direction of the core shaft 2. The groove width of the second annular groove 13 is smaller than the groove width of the first annular groove 8. Twelve second spiral fins 6 are provided between the two second annular grooves 13. The flow direction of the fluid in the mixing zone is as follows: Figure 6 As shown, the direction of the arrow in the figure is the flow direction of the fluid.

[0043] In order to further improve the mixing effect of the fluid, the helical angle of the second helical fin 6 of the first subunit is 32.5 degrees, and the helical directions of the second helical fins 6 of two adjacent subunits are opposite.

[0044] A first frustum 9 and a second frustum 10 are provided at the liquid inlet end and the liquid outlet end of the core shaft 2, respectively. The first frustum 9 and the second frustum 10 are both conical, and the small head end of the first frustum 9 is arranged toward the inlet of the shell 1, and the small head end of the second frustum 10 is arranged toward the outlet of the shell 1.

[0045] When the static mixer is working, different fluids enter the housing 1 from the left side of the static mixer at the same time. Figure 2 and Figure 3 As shown, after the fluid is diverted by the first cone 9, the cross-sectional area of ​​the first cone 9 is reduced, and the fluid flow rate increases, so that the fluid enters the pre-diverting unit 3 at a high flow rate. The fluid changes into a spiral fluid flow under the action of the first spiral fin 4, and performs preliminary diversion and mixing. The fluid is divided into multiple streams and enters the mixing unit 5 at the same time. The spiral fluid collides with the second spiral fin 6, changes the flow direction multiple times in a short time, and enhances the collision between the fluids and the mixing effect by moving perpendicular to the axial direction of the core shaft 2 in the first annular groove 8 and the second annular groove 13. After the mixing is completed, it is collected by the second cone 10 and finally flows out of the static mixer.

[0046] As an alternative implementation, Figure 4 As shown, only one subunit is provided on the mixing unit 5 .

[0047] As an alternative implementation, Figure 5As shown, a heat exchange structure 12 is also sleeved on the outer side of the shell 1. The heat exchange structure 12 is provided with an inlet and an outlet. A multi-head spiral groove connected with the inlet and the outlet is formed on the inner wall of the heat exchange structure 12. Heat exchange media such as water, heat transfer oil, and high-temperature steam are introduced into the heat exchange structure 12 through the inlet. The heat exchange medium is evenly distributed to the outer wall of the shell 1 through the multi-head spiral groove and exchanges heat with the shell 1, thereby adjusting the internal temperature of the shell 1 and mixing the fluids within different temperature ranges.

[0048] As an alternative embodiment, the helical angle of the second helical fin 6 of the first subunit is 45 degrees, the helical angle of the second helical fin 6 of the second subunit is 75 degrees, the helical angle of the second helical fin 6 of the third subunit is 25 degrees, the helical angle of the second helical fin 6 of the fourth subunit is 60 degrees, and the helical angle of the second helical fin 6 of the fifth subunit is 45 degrees. That is, the helical angle of the second helical fin 6 can be flexibly selected within the range of 25-75 degrees as needed.

[0049] As an alternative embodiment, the shapes of the first frustum 9 and the second frustum 10 may be hemispherical or stepped.

[0050] As an alternative embodiment, the housing 1 is an integrally formed hollow cylindrical shell. The housing 1 is provided with an inlet for fluid to enter at one end and an outlet for fluid to flow out at the other end along the axial direction.

[0051] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A static mixer, characterized in that: include: Housing (1); A core shaft (2) is arranged inside the shell (1), the core shaft (2) having a pre-distribution unit (3) close to the liquid inlet end and a mixing unit (5) connected to the pre-distribution unit (3), the pre-distribution unit (3) being provided with a plurality of first spiral fins (4), the mixing unit (5) being provided with a plurality of second spiral fins (6), and the spacing between two adjacent first spiral fins (4) being greater than the spacing between two adjacent second spiral fins (6); The mixing unit (5) comprises a plurality of sub-units arranged at intervals along the axial direction of the core shaft (2), a first annular groove (8) being provided between two adjacent sub-units, and the first spiral fin (4) extending from one end to the other end of the pre-distribution unit (3) along its rotation direction; the second spiral fin (6) comprises a plurality of sub-fins arranged at intervals from one end to the other end of the sub-unit along its rotation direction, a second annular groove (13) being formed between two sub-fins of the second spiral fin (6) arranged at intervals along the axial direction of the core shaft (2), the groove width of the second annular groove (13) being smaller than the groove width of the first annular groove (8), the rotation directions of the second spiral fins (6) of two adjacent sub-units being opposite, and the helical angle of the second spiral fin (6) being 25-75 degrees.

2. The static mixer according to claim 1, characterized in that A first frustum (9) and a second frustum (10) are respectively provided at the liquid inlet end and the liquid outlet end of the core shaft (2); the small end of the first frustum (9) is arranged toward the inlet of the shell (1), and the small end of the second frustum (10) is arranged toward the outlet of the shell (1).

3. The static mixer according to claim 1, characterized in that It also includes a heat exchange structure (12) sleeved on the outside of the shell (1).

4. The static mixer according to claim 3, characterized in that The inner wall of the heat exchange structure (12) is formed with multiple spiral grooves.

5. The static mixer according to claim 1, characterized in that The housing (1) comprises a housing body (14) and an end cover (7) connected via a seal.

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